If a reaction produces 0.75 moles of Na2SO4, how many grams of Na2SO4 are formed? (Molar mass of Na2SO4 = 142 g/mol)

• A. 53.3 g
• B. 106.5 g
• C. 142 g
• D. 0.75 g

Answer: (B)

Verified step by step guidance

1. Identify the given information: the amount of substance produced is 0.75 moles of Na2SO4, and the molar mass of Na2SO4 is 142 g/mol.
2. Recall the relationship between moles, molar mass, and mass: \(\text{mass} = \text{moles} \times \text{molar mass}\).
3. Set up the calculation using the formula: \(\text{mass of Na2SO4} = 0.75 \text{ moles} \times 142 \text{ g/mol}\).
4. Multiply the number of moles by the molar mass to find the mass in grams (do not calculate the final value here).
5. Interpret the result as the mass of Na2SO4 formed from 0.75 moles of the compound.